Centrifugal pump



(No Model.) BEHR- GBNTRIFUGAL PUMP. No. 546.219. Patented Sept. 10,1895.

PATENT HANS C. BEHR, OF SAN FRANCISCO, CALIFORNIA.

CENTRIFUGAL PUMP.

SPECIFICATION forming part of Letters Patent No. 546,219, datedSeptember 10, 1895.

Application tiled December 3, 1894- Serial No. 530,788. (No model.) A

to be a full, clear, and exact description of thev same.

My invention relates to the class of centrifugal pumps with inlets atone side only; and it consists in the novel construction and arrangementof parts hereinafter fully de scribed and specifically claimed, theobject of which is to balance or relieve the pressure on the impeller orrunner, tending to displace it axially or cause end friction againstthecollars on the im peller-shaftl Referring to the accompanyingdrawings for a more complete explanation of my inven tion, Figure I isasection of thepump through the center line of the impeller-shaft. is asection in a plane at right angles to the center line ofi1npeller-shaft- Theimpeller of the pump is an incased one, the casingconsisting of one side A, having a central inlet-opening, and curvedoutwardly at its center toward a cylindrical form to meet and join theinlet G of the pump. The other side A2 of the impeller-casing extends tothe center, Where it is formed into or joins the hub P, secured to theimpeller-shaft E, which is mounted in a suitable bearing in the exte'rior housing or shell A. The two sides A and A2 of the impeller areconnected by suitable radial blades, such as the 'long ones B, hereshown, and the short intervening ones C. IIoles O O near the hub Ipermit of the equalization of the pressure on the central part of thecasing side A2. A conoidal shield Il, of a diameter approximately thesame as the inlet-opening to the impeller in the side A', covers theinner central part of the side A2, with its openings O O, and comes intoproximity with said side at the periphery of the shield, as shown at K2.

The function of the shield U ,may be described as follows: In ordinarysingle-inlet pumps it is a part of the impeller and revolves withit. Inthis case it is subject, on the side near the housing, to the entirepressure due to the centrifugal head existing at the periphery of therunner, Whichvpressure is Fig. 2.

obviously transmitted to the space between outside of runner and shell,as there is no packing at the periphery of runner. On the inner side ofthe runner the pressure is zero at the center and increases outwardlyinpro portion to the square of the radius, so that there exists an overpressure, with the ordi nary single-inlet runner pressing it in onedirection, which pressure has to be taken up by collars againstjournals. These bearings are very liable to heat and grind. By havingthe holes O O the runner is relieved of this side pressure; but thecenter of the runner thus apertured and subject to pressure needs thebracing and support of the shield U.

The impeller sides A A2 come into proximu ity with the outer housing orshell only at the inlets and outlets on said impeller, as is shown atthe points .I and K'.

The shield U is stationary and is secured upon a rod V, which supportsit axially from the hub Z of the web or bridge Z2, formed With orsecured in the inlet-piece G.

Instead ofthe construction just described, the elbow G2 may be directlyattached to the pump-housing and the rod extended through its curvedpart, as shown in dotted lines by V2.

The shield U is maintained in a central position by the enlargedextension W' of the rod V, which said extension extends into the hub Pof the impeller-casing side A2, said hub revolving on the extension,which, with its rod V and shield U, remains fixed and non-rotating. Thegradual curvature of the surface of the shield Uleads the liquid witheasy sweep into the impeller.

In order to lubricate the extension W, the oil-cup Y, communicating withchannels X and X2, leading to l/V, is provided.

I is the discharge-duct of the pump, M the daring nozzle, and N thedischarge-pipe.

Having thus described my invention, what I claim as new, and desire tosecure by Letters Patent, is-

' In a centrifugal pump, the combination, of a casing having one side Awith acentral inlet opening, and curved outwardly at its center to meetand join the inlet pipe of the pump, and having its opposite side A2extended to the center Where it is formed with a hub, with holes in saidside near the hub to equalize p casing sideA2,a conoidal shield of adiameter the hnb of the impeller whereby the shield is approximating thesame as the inlet opening maintained in a central position, a flaringdisin the side A', covering the central part of charge nozzle and adischarge pipe communithe side A2 and its holes, and with itsperipheating therewith.

5 ery in proximity with said side, alternating In witness whereof I havehereunto set my 15 long and short radial Vanes connecting said hand.

sides, a stationary rod for supporting the HANS C. BEHR. shield axially,a web or bridge formed with lVitnesses: or secured in the inlet of thepump, said rod S. H. NOURSE,

1o having an enlarged extension which enters H. F. ASOHECK.

